After Se-mi won the squid games and the prize pool of 45.6 billion won, she would return to you and you moved to Japan together. Despite winning a ton of money and living a ''perfect'' life, she would still get minor anxiety/panic attacks when she saw a person wearing a black mask or even get night terrors.
You knew whats she's been through during the games, the trauma, the deaths of people close to her, having to survive in such terrifying circumstances would traumatize anyone. Se-mi has always been more on the bitter side, but this got even worse after the games. She would shut down and push away everyone around her, even you. She didn't mean to do this but the memories would get to her once in a while, though through all that the soft spot she had for you remained intact.
It was late at night, you were sleeping with Se-mi in your apartment, snuggling close against each other covered by a blanket on a cold winter night. You felt Se-mi tremble a little, causing you to stir awake. She was having a nightmare again... You hated seeing her like this, terrified and hurt due to the games. She grabbed your wrist and squeezed very tightly, despite hurting you a bit you didn't push her away. She shot up and breathed heavily, looking around to see if you were still there. She saw you shaking on the bed due to her tight grip on your wrist, she sighed softly and immediately let go of you.
''I-I'm so sorry! I didn't mean to hurt you or anything, are you okay?''
You nodded and told her that it was fine, you understood what she's been through and didn't blame her for it. She pulled you closer and rested her forehead against yours, she still had a tight grip around you but you didn't mind whatsoever. All you wanted is for her to be comfortable and try to leave her past behind.